Acoustic building material



ACOUSTIC BUILDING MATERIAL Filed June 50, 1926 ligne Q i? a a n n n t aI c o u a o a e o a a u e o n 0 n 0 u J I u s g a o u s n o o u a a v uo g n o n a o u u o o l n o a 0 l 0 o 0 o v o o a n o u a n u n s n e 0a o o u: b u o a u n e o a o o o a o 0 n a e u l 9 a q n l o o g l 6?* 1o u a s u 0 o 0 0 a o o g 0 a o a a a c a l o e g a c e n q D a a a a ov u a a o o a n o o n I n v o I e v Inl/@nier John, J/enrypea/wryPatented Feb. 28, 1928.

UNITED STATES PATENT OFFICE.

JOHN HENRY DELANEY, OF LOS ANGELES, CALIFORNIA, ASSIGNOR TO ADA WALLACEDELANEY, OF LOS ANGELES, CALIFORNIA.

ACOUSTIC BUILDING- MATERIAL.

Application led .Tune 30, 1926. Serial No. 119,588.

This invention relates to the use of building'blocks for surfacing theinteriors of auditoriums, halls, or any rooms in which it is desired toenhance the acoustical properties by providing walls of a soundabsorbing and non-reverberating quality.

In auditoriums at broadcasting stations or any enclosure in which musicor speaking is desired to be heard at 100% distinctness, it has been thecustom to drape or cover the walls with hangings of felt; velour or likesound absorbing material with a view to overcoming the tendency towardreverberation or echoing, and the object of this invention is to providein the construction of Such auditoriums or rooms an interior surface inthe form of blocks or slabs, which `may be laid in similar manner to abrick wall, and which will perform every function of the felt or velourhangings before mentioned and at the same time will insulate such roomsfrom exterior sounds.

An object of the invention is to provide means whereby the builder,workman or architect, may be able to correct poor acoustics of anenclosure by obtaining stock materials suitable for the particularproblem in hand. y

Other objects, advantages and features of invention may appear from theaccompanying drawing, the subjoined detailed dcscription and theappended claims.

The accompanying drawing illustrates the invention in one of the formsin which it may be embodied.

' Figure 1 is a longitudinal section on line -m, Fig. 2, of anacoustical block constructed in accordance with this invention.

Fig. 2 is a face view of the exposed or sound absorbing surface of theblock shown in Fig. l.

Fig. 3 is a fragmental section on a larger scale taken on line x-3, ofFig. 2, showing three stages of development; the fragment at the leftshowing the hollow block omitting the lling; the fragment at the middle,shoving the filling in place, and the portion at #he right showing afragment of the completed block in section on said line :vl-w3.

The acoustic blocks may be of various shapes and sizes and in the formshown in the drawings, comprises a shell 1, which may be made of anysuitable material or materials such for instance as plaster, cement,iibrous material, wood, terra cotta or in some instances, metal. Theform made of plaster' or the like is shownin the drawings and comprisesa perforated facing a, the perforations Z) of which may be of anydesired size and shape, and extend from the outside of the block to theinside cavity c, which is filled with sound absorbing material d whichmay be asbestos wool, loose pumice, hair, corkor substances having likesound absorbing properties.

AIn practical manufacture an open sided box formed of the facing a; andfour cavity surrounding/Walls e, is prepared in any suitable way as bymoulding, and the absorbing lling d is then placed in the box loosely,with sufiicient compactness to prevent it from settling by gravity andleaving an unoccupied space.

Then the backing f is applied and may bc applied in the form of aplastic filling enti rely closing the open side of the box, thuscompleting a block having a perforated facing, a sound absorbingVfilling, surrounding walls, and a closed back.

The material for forming the shell is preferably of a strong porousnature and the perforations Z; in the facing give such facing a highsound absorbing value and may yet be made to receive any ornamentationor to be made smooth and yet attractive as a finish.

When the block 1 has been produced in thc manner stated and the shellhas become set, its sound absorbing character is determined bylaboratory tests and a tag 4 may be applied to the shell at anyconvenient place, and is indexed with markings 5 showing the vpercentageof sound absorbency.

I claim 1. An acoustic block comprising a shell having a perforatedfacing,I and a filling of sound absorbing substance.

2. An acoustic block comprising a porous shell, and a sound absorbinglling.

3. An acoustic block comprising a shell having a perforated facing andan open side; a filling of sound absorbing substance disposed in saidshell and the open side of 5 said block being closed by plasticmaterial.

4. An acoustic block comprising a porous shell having a perforated sideand an open side; a sound absorbing substance disposed in said shell anda plastic filling entirely closing the open side of the block.

lln testimony whereof, l have hereunto set my hand at Los Angeles,California, this 24th day of June, 1926.

JUHN HENRY DELANEY.

